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Lots of changes integrating PDO driver. Still a work in progress.
data.php fully converted... we should test the functions individually
dscourse.class.php converted to PDO
Fixed some small syntax errors
Still more changes in the PDO conversion
More changes and fixes from PDO conversion. Also refactoring some code where redundant
Still more testing and fixes related to PDO. Also updated the mailer in LTI registration
Also updated the mailer in auth.php
Merge branches 'local' and 'master'